A congressional committee wishes to examine the effect of pr

A congressional committee wishes to examine the effect of proposed legislation on the nation\'s high school. It randomly seletcs 5 high schools from the 20 in the Washington D.C. area and conducts a study of those 5 schools. Has the commitee obtained a random sample of the nation\'s high schools?

Solution

No, because the sample came from a biased cluster (Washington DC only), when in fact they want to examine the effect ON THE NATION\'S high school.

Also, there are too few high schools being studied here, as there are many high schools across the nation.